81. If the average bending stress is 6 kg/cm2 for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is
82. A pre-stressed concrete member is preferred because
83. If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)
84. If jd is the lever arm and $$\sum {\text{O}} $$ is the total perimeter of reinforcement of an R.C.C. beam, the bond stress at the section having Q shear force, is
85. The minimum head room over a stair must be
86. For stairs spanning $$l$$ meters longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is
87. If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is
88. Total pressure on the vertical face of a retaining wall of height ‘h’ per unit run exerted by the retained earth weighing ‘w’ per unit volume, is
89. According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is
90. For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is
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